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Looking for best place to find specific lead acid battery

I'm looking at bringing a machine down from the States that requires a 12v 18ah rechargeable battery -- quite similar to a motorcycle battery. The one it has is a lead acid, so TSA says it can't make the trip. I'm trying to find where I can find the same battery in Cuenca. I imagine it wouldn't be hard to find, but I'm trying to find a battery first before lugging the machine down.